I thought I would share my experience of this product. I have a 54 Plate T2 D4D Avensis and currently have 176,000 on the clock. A work colleague mentioned something about a product that he had seen on"Wheeler Dealers". I did some research and found that the product was called Terraclean. I checked out a number of other Car forums e.g.Vauxhall, Ford, Jaguar etc...and the consensus was it worked. The only negative posts were from users who said they did'nt notice any difference. I could find noth